Six domain chain brief introduction before the formal introduction of the six domain chain, we might as well know simply what the "six domain" is. The six domain is the abbreviation of the six domain model of the Internet of things. It is the six domain model based on the socialized attribute of the Internet of things. It has been voted by the 33 member countries. It has become the world's first IOT top level architecture international standard project ISO/IEC 30141. If a networking project is a house, then, the basic architecture of six domain model is the house, or that is the beams and columns of the house. So what is the six domain chain? In short, the six domain chain is the underlying public chain of the block chain that serves the Internet of things. Specifically, the six domain chain (SixDomainChain, SDChain) is the world's first centralized public block chain ecosystem integrating the six domain model of the Internet of things, international standard and distributed block chain reference architecture standard. For more convenient geographic interpretation of six...